Mitsubishi Electric QD77MS4 Simple Motion Unit

The Mitsubishi Electric QD77MS4 Simple Motion Unit is a compact motion control interface that delivers basic pulse-output control to coordinate simple drives directly from a MELSEC‑Q PLC. Installed in MELSEC‑Q rack slots and wired via field-terminal screws, it provides motion control without needing a full servo controller for basic positioning, speed control, and pulse generation. The unit supports up to four axes (model dependent), offers high‑speed pulse outputs (platform dependent) in formats such as CW/CCW or pulse/direction, and is designed for use with stepper or simple servo drives. Common applications include conveyor indexing, pick‑and‑place, packaging, material handling, and light‑duty transfer operations where PLC-based motion coordination suffices. Key indicators include status LEDs for the unit and pulse status, and it is specified for industrial-temperature operation. Compatibility is with Mitsubishi MELSEC‑Q PLC systems, enabling basic motion control integration with PLC logic for machine upgrades, legacy module replacement, and coordinated motion tasks without a dedicated motion controller.